/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.handmark.pulltorefresh.library;

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ExpandableListView;

import com.handmark.pulltorefresh.library.internal.EmptyViewMethodAccessor;

public class PullToRefreshExpandableListView extends X1LoadingAdapterViewBase<ExpandableListView> {

    public PullToRefreshExpandableListView(Context context) {
        super(context);
    }

    public PullToRefreshExpandableListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public PullToRefreshExpandableListView(Context context, Mode mode) {
        super(context, mode);
    }

    public PullToRefreshExpandableListView(Context context, Mode mode, AnimationStyle style) {
        super(context, mode, style);
    }

    @Override
    public final Orientation getPullToRefreshScrollDirection() {
        return Orientation.VERTICAL;
    }

    @Override
    protected ExpandableListView createRefreshableView(Context context, AttributeSet attrs) {
        final ExpandableListView lv;
        if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
            lv = new InternalExpandableListViewSDK9(context, attrs);
        } else {
            lv = new InternalExpandableListView(context, attrs);
        }

        // Set it to this so it can be used in ListActivity/ListFragment
        lv.setId(android.R.id.list);
        return lv;
    }

    public interface ParentTypeTag{

    }

    class InternalExpandableListView extends ExpandableListView implements EmptyViewMethodAccessor {

        private int mIndicatorLeft, mIndicatorRight;
        private Drawable mExpandIndicator;
        private Drawable mCollapseIndicator;

        public InternalExpandableListView(Context context, AttributeSet attrs) {
            super(context, attrs);
            computeIndicatorBounds(context);
        }

        @Override
        public void setEmptyView(View emptyView) {
            PullToRefreshExpandableListView.this.setEmptyView(emptyView);
        }

        @Override
        public void setEmptyViewInternal(View emptyView) {
            super.setEmptyView(emptyView);
        }

        /**
         * 初始化indicator并计算indicator的左右位置
         * @param context
         */
        private void computeIndicatorBounds(Context context) {
            final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
            Drawable indicator = context.getResources().getDrawable(
                    R.drawable.icon_subject_indicator_expand);
            final int indicatorWidth = indicator.getIntrinsicWidth();
            final int rightMargin = context.getResources().getDimensionPixelSize(
                    R.dimen.group_indicator_right);
            int left = screenWidth - rightMargin - indicatorWidth;
            mIndicatorLeft = left;
            mIndicatorRight = left + indicatorWidth;
            mExpandIndicator = context.getResources().getDrawable(
                    R.drawable.icon_subject_indicator_expand);
            mCollapseIndicator = context.getResources().getDrawable(
                    R.drawable.icon_subject_indicator_collapse);
        }

        @Override
        protected void dispatchDraw(Canvas canvas) {
            //draw father
            super.dispatchDraw(canvas);
            if (mExpandIndicator == null || mCollapseIndicator == null)
                return;//no indicator to draw
            //为每个item绘制indicator
            for (int i = 0; i < getChildCount(); i++) {
                View item = getChildAt(i);
                int t = item.getTop();
                int b = item.getBottom();
                if ((b < 0) || (t > getBottom()))
                    continue;// This item isn't on the screen
                if (item != null && item.getTag() instanceof ParentTypeTag) {
                    //计算是否展开
                    int groupPosition = getPackedPositionGroup(getExpandableListPosition(getFirstVisiblePosition() + i));
                    if (isGroupExpanded(groupPosition)) {
                        mExpandIndicator.setBounds(mIndicatorLeft, t, mIndicatorRight, b);
                        mExpandIndicator.draw(canvas);
                    } else {
                        mCollapseIndicator.setBounds(mIndicatorLeft, t, mIndicatorRight, b);
                        mCollapseIndicator.draw(canvas);
                    }
                }
            }
        }
    }

    @TargetApi(9)
    final class InternalExpandableListViewSDK9 extends InternalExpandableListView {

        public InternalExpandableListViewSDK9(Context context, AttributeSet attrs) {
            super(context, attrs);
        }

        @Override
        protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX,
                int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {

            final boolean returnValue = super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
                    scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);

            // Does all of the hard work...
            OverscrollHelper.overScrollBy(PullToRefreshExpandableListView.this, deltaX, scrollX, deltaY, scrollY,
                    isTouchEvent);

            return returnValue;
        }
    }

    @Override
    protected View getLoadingView() {
        return null;
    }

    @Override
    protected View getLoadingFooterView() {
        return null;
    }

    @Override
    protected View getNoContentView() {
        return null;
    }

    @Override
    protected View getLoadingErrorView() {
        return null;
    }

    @Override
    protected View getNoNetworkView() {
        return null;
    }
}
